Public hostname should be customizable in dashboard

public hostname should be customizable, not just from domains in account
For example:
CNAME tunnel.test1.com xxxxx.cfargotunnel.com

then configure custom hostnames in Cloudflare for SaaS
Fallback Origin: tunnel.test1.com
Custom Hostnames: www.test2.com

use localmanaged tunnel yaml like this

  - hostname: www.test2.com
    service: http://127.0.0.1

then it works
but if i use dashboard, i can’t add public hostname www.test2.com because it’s not in my account

I’m also curious how to support tunnels using domains in different accounts.